Improvement in blasts for furnaces of steam-boilers



B. GIGUDDT. Blasts for Furnaces of Steam-Boilers.

N0. 144,757, Patented Nov.18,1873.

\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\Q\\\ yx@fk/MVM Lm@ NITED STATES PATENT FFIGE.

REN GIGQDOT, OF LYONS, FRANCE.

IMPROVEMENT IN BLASTS FOR FURNACES OF STEAM-BOILERS.

Specification forming part of Letters Patent No. 144,757, dated November18, 1873; application filed August 27, 1873.

To all whom it may concern:

Be it. known that I, REN GIGODOT, of Lyons, France, have invented anImprovement in Blasts for Furnaces of Steam-Boilers, of which thefollowing is a specication:

This system of blast by injection is founded upon the employment of amixture of air and superheated steam, in order to render the coinbustionin the furnaces of steam-boilers more perfect, thus -adding greatly tothe production of steam without increasing the consumption of fuel.

Steam taken in the saturated state from the boiler is superheated bypassing it through a vessel in or to which a series of tubes arearranged in a flue or smokeway of the furnace, preferably at a shortdistance from the firebars. From thence it is conveyed by one or morepipes into an air-injector or suction-tube, whence it proceeds through avery narrow annular opening, which puts it into the form of a hollowjet, capable of drawing with it a considerable body of air, whichbecomes mingled with its steam, The mixture is thus raised to a veryhigh temperature, which facilitates the decomposition of the steam; andit is in the condition most favorable to combustion when it arrives intothe tuyere, which distributes it into the fire-space or ash-pit of thefurnace.

I will describe the arrangement I have adopted for a boiler of theCornish stamp, with an interior furnace, in reference to the annexeddrawing.

Figure l is a longitudinal section. Fig. 2 is a horizontal section. InFigs. 3, 4, 5, and 6 I have shown the two arrangements I have adoptedfor the injector.

The superheater which I apply to my system is composed of twocollections of tubes, a a a b b b, united at one end by two distinctcollectors, A and B, and at the other end by another collector common,G, to both. Upon the entrance-collector, B, is keyed a pipe, d, whichbrings the saturated steam drawn from the dome D of the boiler. Theexit-collector, A, carries the ajutage, upon which is fixed a curvedtube, f, which is united by a cock, g, socket with the injector I. Theinjector (see Figs. 3 and 4) consists of a cylindrical tube, I, closedby a little plug, c', which is formed like a conical valve, with anut-head at its top. It is pierced with. a threaded hole, which permitsof its being screwed upon a screw, j, fixed in the axis of the tube I,by means of two arms, K K. By screwing the plug i, the section of theannular opening o of the tube can be regulated with the greatestprecision. The injector may be performed as shown in Figs. 5 and 6. Inthis case it consists of a pipe, m, providedw at its end with awhistle-shaped ajutage, n, in which the steam-opening is a very' slightsplit; p. Th'e injector-tube debouches in the center of a funnel-shapedopening, l, which terminates in a conduit, L, placed in a iue or apassage arranged along the length of the boiler, outside. This conduitis curved in front of th'e furnace, and its branch M, forming a tuyere,is united to the partition N of the ash-pit7 beneath the bars I).

Thus air is drawn by the jet of superheated steam proceeding from thetube z', and the mixture of air and steam passed through the conduit andinto the tuyere M, which draws it under the re.

It will be imderstood that the form and position of the superheater andinjector may be varied, according to the sort of boiler and the spaceavailable.

In order to avoid length in the apparatus, several jets may be employed,each in a shorter conduit of smaller diameter.

The jets, in certain cases, may be full. When they are annular theinjectors can be arranged so as to provoke a draft of the exterior air;and the injector may be continuous or intermittent, at will, accordingto the nature of the fuel consiuned in the furnace to which the systemmay be applied.

This system of blast by injection of superheated steam by means eitherof the two bcfore-described injectors may be applied at all themetalhugic and industrial furnaces for all purposes; or at thevblast ofthe mines, for rcplacing the exhausters, ventilators, and blastenginesat present in use.

I do not wish to be understood as broadly claiming the introduction intoa furnace of superheated steam and air, as such I :un a-Ware Intestimony whereof I have si gne my name is not new. i to thisspecification before two subscribing I claim as my invention- Witnesses.The combination of the tubes a b, collectors R. GIGODO'I.

A B, collector C, induction-pipe d, ejectiontube f, open conduit L7terminating in :ttuyeie Witnesses:

beneath the grate-bars, all substantially as T. HUOT,

set forth. J. ARMENGAUD, Jeune.

